This article discusses the importance of seismic resistance for cable trays, detailing when seismic braces are necessary, the factors that affect seismic resistance, and how to ensure your cable tray system can withstand earthquakes. Earthquakes and seismic events can cause severe damage to electrical infrastructure, including cable trays, leading to outages and even safety hazards. During an earthquake, cable trays are exposed not only to gravity loads and normal service loads, but also to lateral movement, vertical acceleration, vibration, and building drift. Cable trays, being an integral part of building electrical and communication systems. Requests for copies of this report should be directed to the EPRI Distribution Center, 207 Coggins Drive, P. Box 23205, Pleasant Hill, CA 94523, (510) 934-4212. There is no charge for reports requested by EPRI member utilities. The following individuals provided valuable technical input to the. The cable tray system represented a large distributed mass that was supported between the top of the equipment cabinets and the roof framing.
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